diff --git a/app/config.py b/app/config.py
index 218613c5..048dbca2 100644
--- a/app/config.py
+++ b/app/config.py
@@ -86,7 +86,11 @@ else:
     OTHER_ALIAS_DOMAINS = []
 
 # List of domains user can use to create alias
-ALIAS_DOMAINS = OTHER_ALIAS_DOMAINS + [EMAIL_DOMAIN]
+if "ALIAS_DOMAINS" in os.environ:
+    ALIAS_DOMAINS = eval(os.environ["ALIAS_DOMAINS"])  # ["domain1.com", "domain2.com"]
+else:
+    ALIAS_DOMAINS = OTHER_ALIAS_DOMAINS + [EMAIL_DOMAIN]
+
 ALIAS_DOMAINS = [d.lower().strip() for d in ALIAS_DOMAINS]
 
 # the alias domain used when creating the first alias for user
diff --git a/example.env b/example.env
index f55db586..53d38731 100644
--- a/example.env
+++ b/example.env
@@ -24,6 +24,9 @@ ENFORCE_SPF=true
 # other domains that can be used to create aliases, in addition to EMAIL_DOMAIN
 OTHER_ALIAS_DOMAINS=["domain1.com", "domain2.com"]
 
+# domains that can be used to create aliases. If set, override OTHER_ALIAS_DOMAINS
+ALIAS_DOMAINS=["domain1.com", "domain2.com"]
+
 # the alias domain used when creating the first alias for user, default to EMAIL_DOMAIN if not set
 # FIRST_ALIAS_DOMAIN = another-domain.com